Never seen them and doubt they ever will. There are a limited amount of authorized retailers in the USA for the OPUSX and there are none on the Net. I found a web site that lists these retailers and converted it to an Excel list. If you would like it, I can e-mail it to you.
By the way, be very wary of counterfeits. Cigarafficionado.com has a counterfeit gallery of various brands including Fuente Fuente OpusX. Its definitely worth a look when you are spending upwards of $30 for a smoke.